We have recently released our new long-expected product – Need4 Video Editor! The program allows you to perform the most common video editing tasks.

With Need4 Video Editor you can:

• Edit video quickly and easily.
• Add separate video and audio tracks, titles and images to the video editing timeline panel.
• Insert various transitions between video clips.
• Apply filters and special effects to your video.
• Automatically create slide shows from your photos.
• Save your video to any popular format as well as prepare it for mobile devices.

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Scanning systems

A scanning system type characterizes the way the image is being redrawn when refreshing picture.
There are two different scanning systems – progressive scanning and interlaced scanning.

Progressive scanning redraws an image frame (all of its lines) when refreshing each picture.

Interlaced scanning system implies that each frame is divided into two half-frames (or fields). One field contains all the odd lines of the image, the other contains all the even lines of the image. Thus, during the first image refresh operation the system draws odd numbered lines, and then draws the remaining even numbered lines during the second refreshing.
This technique allows to double a frame rate of a video signal without consuming extra bandwidth. Interlaced scanning was initially designed for TV broadcasting so that the refresh rate of a screen fits the power frequency.

Watching an interlaced video on a device that uses progressive scanning method causes a very unpleasant effect.

What is the combing effect? Why does it occur?

Interlace (or combing) effect occurs when an interlaced video is being played on a device that employs progressive scanning. Edges of moving objects have the form of a “comb”, the video is covered by horizontal stripes that distort the image (see Pic. 1).

The cause of this effect is that a progressive scanning combines two adjacent half-frames to draw the image. Lines of these two half-frames interleave, that is the first line from the first half-frame is drawn, then the second line from the second half-frame, the third line from the first half-frame, the fourth line from the second half-frame, and so on. The combined half-frames can contain different motion phases, so that the lines are shifted relative to each other, and the picture looks striped.

Where and when can I see the combing effect?

If you watch TV on your computer using a TV tuner, you have probably seen this effect (as computer monitors use progressive scanning system, while TV broadcasting standards imply interlaced scanning).
Many camcorders also shoot interlaced video, so you will see interlace stripes when watching it on your computer.
At last, you can face this problem when ripping DVD, since many DVDs are interlaced too.
You should remember that the combing artifacts are most visible on moving images.

How to get rid of combing artifacts?

To be played correctly by devices that use progressive scanning, an interlaced video is converted into a non-interlaced form. This process is called deinterlacing. The conversion can be performed both hardwarily (by devices, such as TV sets, DVD players and computer video cards) and softwarily (by the means of video conversion software).
For example, Need4 Video Converter allows applying deinterlacing to MPEG video files. Pic.1 gives an instance of software deinterlacing performed by Need4 Video Converter program.

Probably each of us has faced the challenge of missing or accidental deletion of files we value.

The most common causes for that can be:
- Accidentally pressing format or delete button on your camera, camcorder, iPod or smartphone;
- Memory card/flash card shows “unformatted/unallocated” drive when you connect it to your computer;
- Sudden disappearance of a file/folder from your iPod, camera, camcorder or smartphone.

The solution

Disk Doctors Photo Recovery is comprehensive recovery software for any digital media. It features an extremely easy interface and powerful functions that allow you to recover deleted and lost photos, music and video files.

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Key features:

• Recover deleted/lost/missing photos, videos and audio files.
• Recover photos from formatted drives with file names.
• Simple and easy to use three step recovery wizard.
• Support for all popular media file types.
• Supports popular professional DSLRs raw photo files.
• Evaluation of recovery results is more assured with preview option.
• Recover files from IDE/ATA/SATA/SCSI hard disk drives, SD cards, CF cards, xD cards, memory sticks, external zip drives, USB hard drives, iPod, other mp3 players, camcorders and other multimedia devices that rely on memory cards to store files.

Note: If you accidentally deleted files from a drive and want to recover them, never save any data on this drive. Please, install Disk Doctors Photo Recovery on a drive different from which you are going to recover data.

Q: What resolutions HD videos have?
A: The most widely used resolutions are 1920×1080 and 1280×720 pixels.
In Pic. 2 you can see the comparison of the most popular video resolutions, both HD and SD.

Q: What do shorthand names like 1080p, 1080i and 720p mean?
A: Numbers (1080 and 720) stand for a vertical frame resolution of 1080 or 720 lines, respectively.
The letters p and i are used to designate the scanning system: progressive scanning (p) or interlaced scanning (i).
We’ll keep different scanning systems and related problems to be a topic of a next post as it is a good question with a lot to say about. We’ll surely discuss the matters later.
Thus, 1080p stands for 1920×1080 progressive video, 1080i – 1920×1080 interlaced video, 720p – 1280×720 progressive video.

Q: What is Full HD?
A: Full HD is a marketing name for 1080p and 1080i video.

Q: What are the most popular HD formats?
A: Today the most popular HD video container format is MPEG-2 Transport Stream, the most often used codecs are H.264 (AVCHD) and MPEG-2.

Q: Do I need a special device to watch HD video?
A: To be able to watch HD video you need a device (computer monitor, television display, projector, etc.) that can process and display high-definition source video signal. This capability is generally determined by technical characteristics of a display, such as display resolution.

Q: If I convert a standard-definition video to a high resolution, will the output video be an HD video?
A: Nominally, such video can be called HD video, as the main difference between HD and standard video is higher resolution. But if you convert video from a lower resolution to a higher one, the quality of the video will not be improved. There are devices that can upscale video (i.e. convert video from a low resolution to a higher one), but the quality of upscaled videos is still lower that the quality of “true” HD videos.

Q: Comparing the output quality of a video file upgraded to HD with the help of video converting software and an upscaling device, which quality is better?
A: The most conversion programs use simple bilinear upscaling algorithm, while devices use more complex methods allowing to improve picture quality, so that the quality of hardwarily upscaled videos is better that the quality of softwarily converted ones.
However, as we have already said, the quality of upscaled video is worse compared to “true” HD.

Q: How can I tell upscaled video from “true” HD video? Are there any objective characteristics?
A: Unfortunately, there are no objective characteristics that an ordinary viewer can use to differentiate “true” HD video from upscaled video. It can be done visually by comparing video frames: HD video frame will have much more small details than an upscaled video frame (see Pic.1). One can say that HD video contains more information per a square unit.

Previously we have mentioned the most common problems connected with aspect ratio: when you play video on your DVD player it is stretched horizontally or vertically. Such problems can be easily solved hardwarily – by setting a DVD player or a TV set to the correct aspect ratio.

But what can you do if your video is shown incorrectly when being played in a software media player? For example, you have a video file that was converted before and for some reason it was converted with the wrong aspect ratio.

There is one more problem related to aspect ratio. Our users often ask how to remove black bars at the edges of the video.

With Need4 Video Converter you will easily convert your stretched video so that it becomes normal as well as remove unwanted black bars.

Classification of the problems

Let’s systematize all the problems associated with aspect ratio we have mentioned above:

1. The video has incorrect aspect ratio and is stretched
   1. vertically (all objects look narrow and prolonged);
   2. horizontally (all objects look flattened out).
2. The video has correct aspect ratio and is not stretched, but has black bars
   1. on the top and bottom;
   2. on the left and right.

Solution methods

1. Correcting stretched video.
   1. Most probably, a widescreen (16:9) video was stretched to the 4:3 aspect ratio, so that the original aspect ratio was broken. To correct this, we should stretch the video horizontally leaving the height of the video unchanged (see Pic. 1).
      
      Pic. 1: Stretching incorrectly converted video back to 16:9

      Knowing the height of the converted video, we need to calculate its width. Let’s denote the width of the video by W, and the height of the video by H.
      As the converted video is supposed to be 16:9, i.e. W:H = 16:9, the width can be calculated as follows:
      W=16×H:9.

   2. It looks like a 4:3 video was stretched to the 16:9 aspect ratio, so that the original aspect ratio was broken. To correct this, we should compress the video horizontally leaving the height of the video unchanged (see Pic. 2).
      
      Pic. 2: Stretching incorrectly converted video back to 4:3

      The converted video is supposed to be 4:3, i.e. W:H = 4:3, then the width can be calculated as follows:
      W=4×H:3.

2. Removing black bars.
   1. Most likely, a widescreen video (16:9) was converted to 4:3 using the Letter Box resize method. More information about resize methods here.
      The picture looks fine (not stretched), but black bars are added on the top and bottom of the video. This situation can be very unpleasant when you watch this video on your widescreen TV set, as it adds its own bars to the sides of the video to inscribe it to the screen. This is called windowboxing or postage stamp effect. Your video will look as in Pic. 3.
      
      Pic. 3: Windowboxing (postage stamp effect)

      You can remove the bars and return the video to the 16:9 aspect ratio using the Crop resize method. We need to crop the video vertically leaving the width of the video unchanged (see Pic. 4).
      

      Pic. 4: Cropping letterboxed video back to 16:9

      Since the converted video is supposed to be 16:9, i.e. W:H = 16:9, the height can be calculated as follows:
      H=9×W:16.

   2. It appears that a 4:3 video was converted to 16:9 using the Letter Box resize method. In this case black bars are added on the left and right of the video. You can remove them and return the video to the 4:3 aspect ratio using the Crop resize method.
      We need to crop the video horizontally leaving the height of the video unchanged (see Pic. 5).
      
      Pic. 5: Cropping letterboxed video back to 4:3

      The converted video is supposed to be 4:3, i.e. W:H = 4:3, so that the width can be calculated as follows:
      W=4×H:3.

Conversion instructions

To perform conversion of a problematic video file, follow these steps:

• add your video to Need4 Video Converter and select the necessary preset from the Output format drop-down list;
• click Settings under the Output format list;
• uncheck the Video same as input and Keep aspect ratio checkboxes;
• click the Options button in the Video stream area, select the target aspect ratio and click OK;
• specify the width and the height of the converted video that were calculated above;
• select from the Resize method list
  1. Stretch if you want to correct stretched video;
  2. Crop if you want to remove black bars from the edges of your video;
• click OK;
• convert your video.

If you still have problems or need detailed instructions on converting a certain video file, please contact our Support Team.

Dear Friends,

Today, shortly before Christmas, we are happy to announce that we launch Need4Video Partner Program, and now everyone can join it for free. It’s easy, free and profitable!

You simply get your personal partner link, share it with everyone who may be interested in Need4Video software offering them a 20% discount, and get 20% from every sale to your PayPal account.

How it works?

1. First you get your unique Partner link. On our Partner page you provide your email and we send you the link. It leads to the check out page offering to buy Need4Video software at a 20% discount.
2. You post the link on your website, Facebook page, blogs and forums – let your visitors know about the special offer not available from anywhere else!
3. You are welcome to share the link with with everybody who may be interested: your friends, colleagues, your friends’ friends, and so on.
4. When a purchase via your Partner link is made, we transfer your 20% commission to your PayPal account the same day. The more people you share the link with, the more money you earn!

Feel free to contact us for more information at partner@need4video.com.

To quicken computer performance and specifically video conversion speed, we often recommend to our users our partner’s software – Uniblue SpeedUpMyPC 2010. It is a tool that we also use, and we hope you’ll like it as well.

Why is my PC getting slower?

With so many different settings, files and processes to monitor, it is hard to identify just what is slowing you down, let alone implement the necessary technical adjustments to recover speed and performance.

How can I accelerate my computer?

SpeedUpMyPC scans your computer to identify the processes, files and settings that are slowing you down, before wielding a powerful range of tools to optimize your system for improved performance. With single click simplicity, network settings, RAM and CPU function are all scanned, cleaned and tuned for speed, while junk files are deleted for space. The result is a computer that works faster and better.

Christmas sale: Today we offer you to buy SpeedUpMyPC at a 50% off!

What benefits can I expect from SpeedUpMyPC 2010?

• Faster computer start up
• Reduced system slowdown
• A more responsive Windows interface
• Recovered hard drive space
• Optimized browser speed
• Quicker program launches
• Faster Windows search

There are several alternatives possible:

1. You want to keep the aspect ratio of the original video unchanged.
2. You want to change the aspect ratio of the video you have:
   1. convert 16:9 video to 4:3;
   2. convert 4:3 video to 16:9.

Let us review all these cases.

1. To make sure that converted video will have the same aspect ratio as the original video, you should:
   • add it to Need4 Video Converter;
   • right-click on the file and select Information; in the window opened you will find information about your video file, including its aspect ratio;
   • select the necessary preset from the Output format drop-down list;
   • click Settings under the Output format list.
     If the Video same as input checkbox is checked, converted video will have the same resolution and aspect ratio as the original video.
     If the Video same as input checkbox is unchecked by default or you need to uncheck it (for example, when you want to resize your video), make sure that the Keep aspect ratio checkbox is checked.
     For the presets of the DVD Quality Video group you can select the necessary aspect ratio from the corresponding list;
   • click OK;
   • convert your video.
2. Aspect ratio of your video can be changed as follows:
   • add your video to Need4 Video Converter and select the necessary output format;
   • click Settings under the Output format list; uncheck the Video same as input and Keep aspect ratio checkboxes; specify the width and height for converted video;
   • click the Options button in the Video stream area and select from the Aspect ratio list:
     1. 4:3, if you want to convert 16:9 video to 4:3;
     2. or 16:9, if you want to convert 4:3 video to 16:9;
   • click OK;
   • select the necessary resize method from the Resize method list. For more information about resize methods, please check this article;
   • click OK;
   • convert your video.

If you still have problems with aspect ratio, feel free to contact Need4Video Support Team.

According to Wikipedia, aspect ratio of an image is the ratio of the width of the image to its height, expressed as two numbers separated by a colon, e.g. x:y (pronounced “x-to-y”) .

The most widely used aspect ratios

The most common video aspect ratios are 4:3 and 16:9.

• The 4:3 ratio for standard television has been in use since television’s origins and many computer monitors employ the same aspect ratio.
• 16:9 is the international standard format of HDTV, non-HD digital television and analog widescreen television.

These aspect ratios can be easily distinguished. 4:3 has more “square” form, while 16:9 is more “rectangular” (See Pic. 1).

It should be mentioned that 16:9 aspect ratio is considered to be more aesthetically pleasing and closer to human eyesight. This aspect ratio approximates to the so-called golden ratio.

Most common problems connected with aspect ratio

1. All objects look narrow and prolonged, faces are “long”. This can happen, for example, when you watch a widescreen video (16:9 aspect ratio) on a square TV set that has 4:3 aspect ratio, so that your video is stretched vertically to fit the screen of the TV set (see Pic. 2).
   
   Pic. 2: Video stretched to 4:3 compared to the original video (16:9)
2. All objects look flattened out. This can happen if you watch an old movie or TV show that was shot in 4:3 aspect ratio on a widescreen TV set, so that your video is stretched horizontally (see Pic. 3).
   
   Pic. 3: Video stretched to 16:9 compared to the original video (4:3)

How to solve aspect ratio problems

Many problems connected with aspect ratio can be solved hardwarily – by setting a DVD player or a TV set to the necessary aspect ratio.
If you want to convert your video, you should remember about aspect ratio. Here you can find some tips on converting video with a glance of aspect ratio.

Why aspect ratio and frame size shouldn’t be mistaken

Probably, you know that a pixel is the smallest unit of an image. In video files square pixels are primarily used. It is evident that the width and height of a square pixel are equal to each other. In this case, the ratio between video dimensions in pixels will correspond to the aspect ratio of the video file. For example, a video file which consists of square pixels has 640*480 resolution, and its aspect ratio is 4:3 (640:480 = 4:3).

However, DVD files often use non-square pixels (they have rectangular shape, and the pixel width slightly differs from its height). In this case, the ratio between video dimensions in pixels will differ from the aspect ratio of the video file. For example, a 4:3 DVD video can have 720*480 resolution (720:480 ≠ 4:3). This difference is conditioned by different dimensions of a non-square pixel.

We have finally released a new long-awaited version of Need4 Video Converter! We did our best to take into account all your wishes and make Need4 Video Converter user interface clearer and more attractive.

What other improvements are included?

• Multicore video processing. Now you can add several files and convert them simultaneously using all CPU cores of your computer.
• More presets for devices, including iPad, iPod Nano, Google Nexus One, Motorola Droid, Zune HD and many others.
• Upgraded conversion module. New media file conversion unit which is more stable and reliable now.
• Help section.
• Some more new features and interface improvements.
• Bug fixes.

We attempted to make Need4 Video Converter more functional, faster and easier to use. We hope that you’ll like it.

Download and try Need4 Video Converter 8 today!